GtkTreeViewColumn segfault

static gint
create_audio_jack_ports_view (GtkListStore  *list_store,
                              GtkWidget     *view,
                              const gchar   *port_clicked,
                              jack_client_t *client)
{
    GtkCellRenderer *renderer;
    GtkTreeViewColumn *column;
    GtkCellRenderer *toggle;
    GtkTreeViewColumn *toggle_column;
    jack_port_t *jack_port;
    gint i;
    gint j;
    const gchar **from_ports_array;
    const gchar **to_ports_array;
    GtkTreeIter iter;

    i = 0;
    renderer = gtk_cell_renderer_text_new ();
    column = gtk_tree_view_column_new_with_attributes (NULL,
                                                       renderer,
                                                       "text",
                                                       NULL);

    from_ports_array = jack_get_ports (client,
                                       NULL,
                                       JACK_DEFAULT_AUDIO_TYPE,
                                       JackPortIsOutput);

    to_ports_array = jack_get_ports (client,
                                     NULL,
                                     JACK_DEFAULT_AUDIO_TYPE,
                                     JackPortIsInput);

    while (to_ports_array[i])
    {
        i++;
    }

    GType types[i];

    for (j = 0; j <= i; j++)
    {
        if (j == 0)
        {
           types[j] = G_TYPE_STRING;
        }
        else
        {
            types[j] = G_TYPE_BOOLEAN;
        }
    }

    list_store = gtk_list_store_newv (i, types);

    i = 0;
    while (from_ports_array[i])
    {
        const gchar *jack_port_string;

        jack_port_string = get_matched_gtk_jack_port (from_ports_array[i],
                                                      port_clicked,
                                                      client);

        if (jack_port_string != NULL)
        {
            gtk_list_store_append (list_store, &iter);
            gtk_list_store_set (list_store,
                                &iter,
                                0,
                                jack_port_string,
                                -1);
        }

        i++;
    }

    gtk_tree_view_append_column (GTK_TREE_VIEW (view), column);

    i = 0;
    while (to_ports_array[i])
    {
        const gchar *jack_port_string;

        jack_port_string = get_matched_gtk_jack_port (to_ports_array[i],
                                                      port_clicked,
                                                      client);

        if (jack_port_string != NULL)
        {
            j = 1;

            /*gtk_list_store_set (list_store,
                                &iter,
                                j,
                                FALSE,
                                -1);*/

            toggle = gtk_cell_renderer_toggle_new ();

            gtk_cell_renderer_toggle_set_radio (GTK_CELL_RENDERER_TOGGLE (toggle),
                                                TRUE);
        /*
             * THIS WHERE MY PROBLEM SEEMS TO BE.
             */
      -----> toggle_column = gtk_tree_view_column_new_with_attributes (jack_port_string,
                                                                      toggle,
                                                                      NULL);

            gtk_tree_view_append_column (GTK_TREE_VIEW (view), toggle_column);
        }

        i++;
    }

    gtk_tree_view_set_model (GTK_TREE_VIEW (view), GTK_TREE_MODEL (list_store));

    g_object_unref (list_store);
    jack_free (from_ports_array);
    jack_free (to_ports_array);

    g_print ("From audio action success\n");

    return 0;
}